Java @org.springframework.beans.factory.annotation.Autowired(required=true)注入点有以下注释：SpringBoot

我得到了这个错误: "

***************************
APPLICATION FAILED TO START
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Description:

Field questionDao in com.surbhi.quizapp.service.QuestionService required a bean of type 'com.surbhi.quizapp.dao.QuestionDao' that could not be found.

The injection point has the following annotations:
    - @org.springframework.beans.factory.annotation.Autowired(required=true)

Action:

Consider defining a bean of type 'com.surbhi.quizapp.dao.QuestionDao' in your configuration.

" 我有以下文件 struct 和文件.

File structure:. https://i.stack.imgur.com/8jSrf.png.

QuestionService.java

@Service
public class QuestionService {

  QuestionDao questionDao;

  public QuestionService(QuestionDao questionDao) {
    super();
    this.questionDao = questionDao;
  }

  public ResponseEntity<List<Question>> getAllQuestions() {
    try {
      return new ResponseEntity<>(questionDao.findAll(), HttpStatus.OK);
    } catch (Exception e) {
      e.printStackTrace();
    }
    return new ResponseEntity<>(new ArrayList<>(), HttpStatus.BAD_REQUEST);
  }

  public ResponseEntity<List<Question>> getQuestionsByCategory(
    String category
  ) {
    try {
      return new ResponseEntity<>(
        questionDao.findByCategory(category),
        HttpStatus.OK
      );
    } catch (Exception e) {
      e.printStackTrace();
    }
    return new ResponseEntity<>(new ArrayList<>(), HttpStatus.BAD_REQUEST);
  }

  public ResponseEntity<String> addQuestion(Question question) {
    questionDao.save(question);
    return new ResponseEntity<>("success", HttpStatus.CREATED);
  }
}

QuestionDao.java

@Repository
public interface QuestionDao extends JpaRepository<Question, Integer> {
  List<Question> findByCategory(String category);

  @Query(
    value = "SELECT * FROM question q Where q.category=:category ORDER BY RANDOM() LIMIT :numQ",
    nativeQuery = true
  )
  List<Question> findRandomQuestionsByCategory(String category, int numQ);
}

我也试过删除@ Autowire并创建构造函数，但也没有工作，并给出了这个错误

***************************
APPLICATION FAILED TO START
***************************
Description:

Parameter 0 of constructor in com.surbhi.quizapp.service.QuestionService required a bean of type 'com.surbhi.quizapp.dao.QuestionDao' that could not be found.

Action:
Consider defining a bean of type 'com.surbhi.quizapp.dao.QuestionDao' in your configuration.

我应该怎么做，还补充道

@SpringBootApplication(scanBasePackages={ "com.surbhi.quizapp.controller", "com.surbhi.quizapp.dao","com.surbhi.quizapp.model","com.surbhi.quizapp.service"})个

在Main中，但这也不起作用.

已使用@ EntrowentScan，不起作用

Main class file:个

@SpringBootApplication

@ComponentScan("com.surbhi.quizapp.dao")

public class QuizappApplication {

    public static void main(String[] args) {
        SpringApplication.run(QuizappApplication.class, args);
    }

}